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Fig. 1


Volume cooling rates for nH = 1 cm-3, following Sutherland & Dopita (1993) for high temperatures (T > 104 K), and Maio et al. (2007) for low temperatures (T < 104 K), as a function of temperature and metallicity Z = [Fe/H] (Z = 0 is solar). In the code, we use exact density-dependent cooling functions for the low temperature part, cf Sect. 2.1.

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